G = { (
4; 3), (5; 3), (5; 4), (6; 3), (6; 4), (6; 5), (7; 3), (7; 4), (7; 5), (7; 6),
(8; 3), (8; 4), (8; 5), (8; 6), (8; 7), (9; 3), (9; 4), (9; 5), (9; 6), (9; 7)}.
Uning grafi I.14-rasmdagi ko’rinishda bo’ladi. Yoki
Y =
{2; 4; 5; 6; 8}
to’plamda
Q
:
«
x
soni
y
soniga karrali» («
x
⋮
y » )
munosabati berilgan bo’lsin.
Munosabat grafida birinchisi ikkinchisiga karrali sonlar juftligidan iborat
bo’ladi.
G =
{(2; 2), (4; 2), (4; 4), (5; 5), (6; 2), (6; 6), (8; 2), (8; 4), (8; 8)}
munosabat grafida (2; 2) juftlikni ko’rsatuvchi strelkaning boshi ham, oxiri
ham bitta nuqtada bo’ladi, bunday strelkani «halqa» deb ataymiz. Munosabat
grafi I.15-rasmdagi kabi chiziladi:
